KVM = Keyboard, Video, Mouse switch. One of the little boxes that let you use one keyboard, one mouse, and one monitor with two (or more) computersm, by switching between computers. For example, one of
these.
As for using the same bluetooth equip on two computers? My Apple Wireless Keyboard and Apple Wireless Mouse work fine on two separate computers, even pairing automatically. But the trick is that I have to have one of the comptuers Bluetooth turned off to guarantee that it pairs with the other computer. And if that was my only keyboard and mouse on one of the computers, it would mean I couldn't turn Bluetooth back on. (But mine are both laptops, so they both have internal kb/trackpads.)
And one of them is a PowerBook, the other is an XP-running PC. How do I get it to work? Well, I turn one of the two on, and hit a button on my keyboard, and click a button on my mouse. It then pairs with the computer that is turned on. If I want to use them with the other computer, I just turn Bluetooth off on the current one (either by disabling it, or turning the whole computer off,) then hit the mouse button and a button on the keyboard, and it finds the second computer. (This assumes that I have sucessfully paired each of them in the past...) Unfortunately, since the PowerBook supports wake-from-Bluetooth, I can't just put the PowerBook to sleep to 'disable' Bluetooth; I have to actually go to the Bluetooth status item and choose 'Turn Bluetooth Off'. With the PC, putting it to sleep is enough; since it can't wake from Bluetooth, the mouse and keyboard don't see the PC, and reconnect to the Mac.
(On an unrelated note: Since you can wake on Bluetooth, why can't Apple enable wake-on-LAN over AirPort?)